Methods of reversible-addition fragmentation chain transfer step-growth polymerization and polymers therefrom
OwnerWei YOU, Joji TANAKAinventors
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Abstract
The subject matter described herein is directed to methods of preparing linear and brush polymers with functional backbones and the polymers prepared therefrom. The methods are termed RAFT step-growth polymerizations and can prepare unique polymers by using a step-growth mechanism to insert multiple functionalities into the polymer backbone. The methods include facile syntheses to obtain tunable polymers, including a two-step process to obtain tunable bottlebrush polymers.
Claims43
A RAFT step-growth polymerization process, comprising
- allowing a RAFT step-growth adduct to polymerize in a step-growth process in the presence of a solvent and one or more of the following:
- an initiator, visible light and a photocatalyst,
- wherein a RAFT step-growth polymer comprising one or more inserted backbone functional units and a RAFT agent residue in each repeat unit in the backbone of the polymer is prepared.
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A polymer comprising a functional backbone, wherein the polymer has the formula:
- wherein,
- MA and MA′ in each instance, is independently a residue of a monomer;
- LX, in each instance, is independently a covalent bond or a linker covalently bound to MA and to RMp;
- RMp, in each instance, is independently a residue of a first backbone functional unit;
- Z is selected from the group consisting of —S—C1-20 alkyl, —O—C1-20 alkyl, phenyl, —O-phenyl, pyrrolyl and NRxRy;
- wherein, Rx and Ry are each independently selected from the group consisting of C1-20 alkyl and pyridinyl;
- and,
- n is an integer from 1 to 1,000.
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A polymer comprising a functional backbone, wherein the polymer has the formula:
- wherein,
- MA and MA′ in each instance, is independently a residue of a monomer;
- LX, in each instance, is independently a covalent bond or a linker covalently bound to MA and to RMp;
- RMp, in each instance, is independently a residue of a first backbone functional unit;
- MB is a residue of a monomer;
- m is an integer from 1 to 1,000;
- Z is selected from the group consisting of —S—C1-20 alkyl, —O—C1-20 alkyl, phenyl, —O-phenyl, pyrrolyl and NRxRy;
- wherein, Rx and Ry are each independently selected from the group consisting of C1-20 alkyl and pyridinyl;
- and,
- n is an integer from 1 to 1,000.
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A polymer comprising a functional backbone, wherein the polymer has the structure:
- wherein, # and ## each independently denotes attachment to a terminal group selected from the group consisting of:
- wherein,
- M1 and M2, in each instance, is independently a residue of a monomer;
- V is a residue of an initiator;
- RY1 and RY2 are each independently a residue of a first backbone functional unit;
- G is a residue of a second backbone functional unit;
- Z is selected from the group consisting of —S—C1-20 alkyl, —O—C1-20 alkyl, phenyl, —O-phenyl, pyrrolyl and NRxRy;
- wherein, Rx and Ry are each independently selected from the group consisting of C1-20 alkyl and pyridinyl;
- and,
- n is an integer from 1 to 1,000.
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A polymer comprising a functional backbone, wherein the polymer has the structure:
- wherein, # and ## each independently denotes attachment to a terminal group selected from the group consisting of:
- wherein,
- M1 and M2, in each instance, is independently a residue of a monomer;
- V is a residue of an initiator;
- MB is residue of a monomer;
- m is an integer from 1 to 1,000;
- LY is a linker covalently bound to M1 and/or M2;
- RY1 and RY2 are each independently a residue of a first backbone functional unit;
- G is a residue of a second backbone functional unit;
- Z is selected from the group consisting of —S—C1-20 alkyl, —O—C1-20 alkyl, phenyl, —O-phenyl, pyrrolyl and NRxRy;
- wherein, Rx and Ry are each independently selected from the group consisting of C1-20 alkyl and pyridinyl;
- and,
- n is an integer from 1 to 1,000.
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Dependencies are inferred from the claim text.